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Charger unplugged alarm: a siren when someone pulls your phone's cable

Plug your iPhone in, make sure Charger Alarm is on (it is by default), then tap ARM. Pull the cable while it's armed and the siren starts, logged as "Charger unplugged". One thing trips people up: the phone must already be charging the moment you arm it, or there's nothing to unplug and the guard just sits there doing nothing.

3 min read · Updated 2026-09-07

Why a charging phone needs its own alarm

Shared outlets at airports, cafes and libraries are where phones sit alone the longest. The cable ties it to the wall, so taking the phone means pulling the plug first, and that's the one move you can't avoid making.

It also covers you where motion struggles. A vibrating counter or a table people keep bumping forces you to turn sensitivity down, but the cable trigger stays sharp either way.

How to set up the charger unplug alarm

  1. Open Settings in Don't Touch and check that Charger Alarm is switched on.
  2. Plug the phone into the charger and wait until iOS shows it is charging.
  3. Go back and tap ARM, then put the phone down during the countdown.
  4. Read the guard line: with motion and charger both active it shows "Motion · Charger guards active".
  5. Leave the app open with the screen on. When you are back, tap DISARM and enter your PIN before you unplug.

How the app decides the cable was pulled

The guard watches the phone's battery state. At arming it records whether the phone is plugged in. It fires only on a change from plugged in to unplugged that happens after that moment.

When the Charger Alarm fires
At the moment you tap ARMWhat happens nextResult
ChargingCable pulled outSiren, reason "Charger unplugged"
ChargingCable stays inNo trigger from this guard
Not chargingCable plugged in, then pulledNo trigger: the guard was never active
Not chargingNothingGuard inactive; motion (and pocket, if on) still work

This is on purpose: a phone armed without a cable can never be tripped by this guard, so there is no false alarm from a battery reading that flickers.

Common mistakes

  • Arming, then plugging in. Order matters here: the app only guards a cable that was already there when you tapped ARM.
  • Turning the switch off and forgetting about it. If the guard line shows fewer guards than you expect, check Charger Alarm in Settings.
  • A loose cable or a worn port. A brief connection drop can set the siren off for no reason at all.
  • Walking off with the app in the background. Like the other guards, this one only runs while the app is open and armed.

Combine it with the motion guard

On a solid desk, keep both on: someone who lifts the phone without unplugging trips motion, and someone who pulls the cable trips the charger guard. Where the surface shakes, lower Motion Sensitivity and let the cable do most of the work.

Questions and answers

Is there an alarm for when my charger is unplugged?
Yes, the Charger Alarm in Don't Touch. It is free and on by default, and it sounds the siren when a cable that was connected at arming is pulled out.
Why didn't the charger alarm go off?
Most often the phone was not charging when you tapped ARM. Plug in first, check the phone shows it is charging, then arm.
Does it work with wireless chargers?
The guard reads the phone's charging state, not the type of charger. Lifting a phone off a wireless pad ends charging, and moving it will usually trip the motion guard as well.
Can I use only the charger alarm without motion?
The motion guard has no separate switch, but you can make it far less touchy by moving Motion Sensitivity down to Low — needs a firm bump.

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